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wifi: cfg80211: add a flag to disable wireless extensions 

commit be23b2d7c3b7c8bf57b1cf0bf890bd65df9d0186 upstream.

Wireless extensions are already disabled if MLO is enabled,
given that we cannot support MLO there with all the hard-
coded assumptions about BSSID etc.

However, the WiFi7 ecosystem is still stabilizing, and some
devices may need MLO disabled while that happens. In that
case, we might end up with a device that supports wext (but
not MLO) in one kernel, and then breaks wext in the future
(by enabling MLO), which is not desirable.

Add a flag to let such drivers/devices disable wext even if
MLO isn't yet enabled.

Cc: stable@vger.kernel.org
Link: https://msgid.link/20240314110951.b50f1dc4ec21.I656ddd8178eedb49dc5c6c0e70f8ce5807afb54f@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Berg 2024-03-14 11:09:51 +01:00 committed by Greg Kroah-Hartman
parent 6b948b54c8
commit 6956ba7da7
2 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/cfg80211.h
View File

@ -4816,6 +4816,7 @@ struct cfg80211_ops {
* @WIPHY_FLAG_SUPPORTS_EXT_KCK_32: The device supports 32-byte KCK keys.
* @WIPHY_FLAG_NOTIFY_REGDOM_BY_DRIVER: The device could handle reg notify for
* NL80211_REGDOM_SET_BY_DRIVER.
* @WIPHY_FLAG_DISABLE_WEXT: disable wireless extensions for this device
*/
enum wiphy_flags {
WIPHY_FLAG_SUPPORTS_EXT_KEK_KCK = BIT(0),
@ -4827,6 +4828,7 @@ enum wiphy_flags {
WIPHY_FLAG_4ADDR_STATION = BIT(6),
WIPHY_FLAG_CONTROL_PORT_PROTOCOL = BIT(7),
WIPHY_FLAG_IBSS_RSN = BIT(8),
WIPHY_FLAG_DISABLE_WEXT = BIT(9),
WIPHY_FLAG_MESH_AUTH = BIT(10),
WIPHY_FLAG_SUPPORTS_EXT_KCK_32 = BIT(11),
/* use hole at 12 */

7
net/wireless/wext-core.c
View File

@ -4,6 +4,7 @@
* Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
* Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
* Copyright (C) 2024 Intel Corporation
*
* (As all part of the Linux kernel, this file is GPL)
*/
@ -662,7 +663,8 @@ struct iw_statistics *get_wireless_stats(struct net_device *dev)
dev->ieee80211_ptr->wiphy->wext &&
dev->ieee80211_ptr->wiphy->wext->get_wireless_stats) {
wireless_warn_cfg80211_wext();
if (dev->ieee80211_ptr->wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO)
if (dev->ieee80211_ptr->wiphy->flags & (WIPHY_FLAG_SUPPORTS_MLO |
WIPHY_FLAG_DISABLE_WEXT))
return NULL;
return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
}
@ -704,7 +706,8 @@ static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
#ifdef CONFIG_CFG80211_WEXT
if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy) {
wireless_warn_cfg80211_wext();
if (dev->ieee80211_ptr->wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO)
if (dev->ieee80211_ptr->wiphy->flags & (WIPHY_FLAG_SUPPORTS_MLO |
WIPHY_FLAG_DISABLE_WEXT))
return NULL;
handlers = dev->ieee80211_ptr->wiphy->wext;
}